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LAUNCHXL-F28379D: CAN Interrupt with SysConfig

vincent liebart
Intellectual 315 points
Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: SYSCONFIG, C2000WARE

Hello,

I started to work on CAN applications.

I tried to use SysConfig for that.

I can send a message but I cannot use Interrupts. Down here what I did on SysConfig, and in my code. My coal is to generate an interrupt each time the Message 1 is sent.

1) I enabled IE1, message transfer completed or bus error

For the Global Interrupt lines, I selected  Global_INT0 and GLOBAL_INT1. 

I chose Global_INT0 even if I don't want to use this line. I don't know why, but there is a warning message if I don't choose this option:

(I didn t Enable Line 0 Interrupts)

2) I only Use Message 1 Mailbox

3) This mailbox is configured as a transmitt mailbox. I ask for a transmitt interrupt, and connect it to Line1:

4) I enabled Interrupts in the PIE:

5) In the ISR 1, I clear the Interrupt Status, the Global Interrupt Status, and acknowledge the group

But the problem is that I never enter in the ISR, although the message is correctly sent by the command

So, my questions are:

- what does the warning message mean ?

- why do I never enter in the ISR ?

- Does my code in the ISR make sense ?

Thank you to anyone who will help me !

  • +1
    TI__Guru* 95155 points

    So you are able to monitor the message on the bus (i.e. the frame is actually transmitted on the bus) but no interrupt is asserted? 

    Can you try can_ex3_external_transmit.c from C:\ti\c2000\C2000Ware_5_01_00_00\driverlib\f2837xd\examples\cpu1\can? I would like to see if interrupts work with that example.

  • +1 in reply to Hareesh Janakiraman
    Intellectual 315 points

    Hello Hareesh. Thank you for helping me.

    You well understood: I am able to monitor the CAN transmission from the C200, but the programm never enter in the transmitt sub routine.

    (The C200Data is the message sent by the C2000 microcontroller)

    I already saw the example, and it helps me to code what is needed in the ISR. I could not run it on my board because I m not able to use CANA and CANB modules.

    Also, this examples does not contain any SysConfig Files.

    So, Can you just take a look at the archive I joint to this thread. I specially make it for you:

    It only contains an ISR for the transmitt of Object 1

    - Object 1 asserts Line 1 Interrupt on transmit message

    - CANB enables Line 1 and message complete Interrupt and Global Line 1

    - PIE enables Can Interrupt 1

    I have many questions:

    - the main one: why the programm never enters into the ISR ?

    - Why the programm runs although there is no declared memory for CAN in the CMD File ?

    - I don t understand how to use the CAN_getInterruptCause function. What is the interrupt register it returns ?

    - is the CAN_clearInterruptStatus function necessary in the ISR ?

    - Why SysConfig warns the user if Global Line 0 is enabled even if Line 0 is disabled ? (below)

     

    Thank you.

    Archive_TI.zip